Jimmy Kimmel’s Uncle Frank, who was a character on the late-night show, died yesterday at age 77.

Frank Potenza, Kimmel’s real-life uncle, served as both a security guard for the show and was featured in many of its comedy sketches.

The cause of his death was not reported.

Potenza, a Korean War veteran, worked as a New York City police officer for 20 years and spent another 20 years as a security guard at Caesar’s Palace in Las Vegas and New York’s St. Patrick’s Cathedral.

He moved to Los Angeles to join “Jimmy Kimmel Live!” in 2003.

“During his 9-year run on air, Uncle Frank contributed many great moments to ‘Jimmy Kimmel Live!,’ ” the show wrote in a statement.

“He was beloved by his co-workers and considered an uncle to all. His kindness and humor will be missed by everyone he touched.”

Kimmel, writing Tuesday on his Twitter account, thanked his fans for their “kind words about a very kind man — my Uncle Frank.